Software to debug PHP programs

Is there any free or commercial software which I could use to debug a php application step by step?
Who is Participating?
Greg AlexanderConnect With a Mentor Lead DeveloperCommented:
However a free and close comparison is NetBeans for php
Greg AlexanderLead DeveloperCommented:
DistillingExpertsAuthor Commented:
Thank you. Using NetBeans I am getting the following message:
Unable to connect
          Firefox can't establish a connection to the server at localhost.

I am using the following sample application as a test:

What is wrong?
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Greg AlexanderLead DeveloperCommented:
That link was internal... so I can't see it... are you setting up a database connection?
Lukasz ChmielewskiCommented:
You can use Zend debugger or XDebug with it.
Ray PaseurCommented:
Firefox can't establish a connection to the server at localhost.

I don't think that is a PHP problem.
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